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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 5309 |
| 3 | 6753291 |
| 4 | 78572361735 |
| 5 | 8085496134786969 |
| 6 | 7094381639133025682975 |
| 7 | 53109062021406984304908116217 |
[21,5309,6753291,78572361735,8085496134786969, 7094381639133025682975, 53109062021406984304908116217] |